G1 – Minor Geomagnetic Storm Alert issued on June 5, 2026

A G1 – Minor Geomagnetic Storm Alert was issued on June 5, 2026. The alert is valid for the synoptic period from 18:00 UTC to 21:00 UTC, with the K-index threshold of 5 reached at 20:02 UTC. The alert remains active according to the latest notice from the NOAA Space Weather Prediction Center.

Potential impacts are expected primarily poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations can occur due to induced currents. There is a possibility of minor impacts on satellite operations. Auroras may become visible at high latitudes, including the northern tier of the United States such as northern Michigan and Maine. These impacts are typical for a G1 – Minor Geomagnetic Storm as classified by NOAA.

According to the latest forecast discussion, this geomagnetic activity is primarily being driven by the arrival of multiple coronal mass ejections (CMEs) from June 3. Solar wind parameters increased significantly early on June 5, and disturbed geomagnetic conditions are expected to continue as CME effects persist.